Transmission-gearing.



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' I `APPLIOATIOH FILED FEB. 6, 1908. 968, 1 89. Patented Aug. 23, 1910.

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UNITED STATES PATENT OFFICE.

CLARK W. PARKER, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO PARKERTRANS- MISSION & APPLIANCE COMPANY, A CORPORATION OF MASSACHUSETTS.

TRANSMISSION-GEARING.

To all whom it may concern.'

Be it known that I, CLARK W. PARKER, a citizen of the United States ofAmerica, and a resident of Springfield, county of Hampden, and State ofMassachusetts, have invented certain new and useful Improvements inTransmission-Gearing, of ywhich the following is a specification,reference being had to the accompanying drawings, forming a partthereof.

My invention relates to improvements in transmission gearing, andparticularly to transmission gearing involving change speed and reversemechanism.

In order that my invention will be fully understood, I will describe anembodiment thereof, having reference to the accompanying drawingsillustrating the same, and will then point out the novel features inclaims.

In the drawings: Figure l is a view in central longitudinal sectionthrough a transmission gearing constituting an embodiment of myinvention. Fig. la is a detail view of a portion of one of the keysemployed. Fig. 2 is a detail front view of certain parts of theoperating mechanism. Fig. 3 is a transverse sectional view upon the line3 3 of Fig. l. Fig. 4 is a detail transverse sectional view upon theline 4 4 of Fig. l.

The mechanism illustrated comprises a drive shaft 20v having a drivevpulley 21 thereon; a driven shaft 22 having a pulley 23 thereon fortransmitting driving movements, and a plurality of complementary gearwheels loosely mounted upon the said shafts. These gear wheels include aseries of four progressivelysmaller gears 24 upon the driving shaft 20,a series of progressively larger gear wheels 25 upon the driven shaftarranged in intermeshing relation with the said gear wheels 24, arelatively large gear wheel 26 upon the driving shaft next to thesmallest gear wheel 24 thereon, a relatively small gear wheel 27 uponthe driven shaft next to the largest gear wheel 25 thereon, the saidgear wheels 26 and 27 being arranged in line with each other but out ofdirect engagement, andan idler wheel 28 arranged in common mesh with thetwo gear wheels 26, 27, whereby they will be connected together indriving relation but whereby driving movements will be imparted from oneshaft to the other in a direction opposite to that imparted through theintermeshing gear wheels 2%25.

Specification of Letters Patent.

Application flied February e, 190s.

Patented Aug. 23, 1910.

Serial No. 414,485.

The driving and driven shafts have each a longitudinal key-way 77 towhich are fitted longitudinal keys 29-30 respectively. The said keys areeach fitted to slide freely in a longitudinal direction in theirrespective key-ways and are each provided with a lateral projection ortooth 33 and with yielding means comprising springs 3l and a presser bar32 arranged to travel therewith, the said springs and presser bar beingpreferably arranged at a point about opposite the tooth or projection33, whereby the said tooth or projection is forced outward with ayielding pressure. The gear wheels 24, 25, 26 and 27 are each providedwith a key-way or slot adapted to receive the tooth or projection 33(see particularly Fig. l of the drawings),so that each said gear wheelis adapted to be connected in driving relation with its shaft by meansof the key carried thereby. The gear wheels are spaced apart by spacingelements which are fitted to each shaft between the wheels thereon, suchelements also constituting reinforcing means for the shafts so as toreinforce them along the portion which contains the key receiving slot.

The keys 29-30 are pivotally connected at their ends opposite to theends having the teeth or projections 33 to traveling rings 36surrounding the shafts 20-22 respectively, said rings being mounted upona traveling carrier 37 to which longitudinal movements are adapted to begiven for the purpose of longitudinally moving the said rings and keyscarried thereby. These movements are transmitted to the `carrier throughrack teeth 38 thereon by means of a traveling gear wheel 39 which isarranged in mesh therewith and with a stationary rack 40, said pinioncarried by a link. 4l which is pivotally connected to an arm 42 upon arock shaft 43, said rock shaft also carrying a quadrant 44, the teeth ofwhich are arranged in mesh with the teeth 45 of a traveling rack bar 46.Movements are given to the rack bar 46 by means of a quadrant 47 whichis mounted upon a vertical operating rock shaft 48, the teeth of thesaid quadrant 47 being arranged in mesh with rack teeth upon the saidbar 46.

Vhat I claim is:

l. Transmission gearing including ashaft having a longitudinal key-waytherein, gear wheels loosely mounted upon the said shaft,

a sliding key disposed Within the said key- Way and having a tooth orprojection adapted to engage the said Wheels, a presser bar alsodisposed Within the said key-Way and having 4studs which project intoreoesses in the said key, whereby the said presser bar is caused totravel longitudinally with the said key, springs surrounding the studsarranged to exert pressure between the said presser bar and the saidkey, and

4means for imparting longitudinal movements to the said key.

2. Transmission gearing including ashaft having a sliding key thereinand elements loosely mounted upon the shaft with Which the said key isadapted to engage, and operating means for imparting movements to thekey comprising a loosely mounted trave1- CLARK W. PARKER.

Witnesses:

CLINTON E. BELL, IDA WEssLER.

